By using innovative methods of packaging and a planar process of chip production, Fairchild made LED into a commercial product with variety of uses. LED with visible light is used as a replacement for incandescent and neon lights, as elements in seven-segment displays, in large RGB screen displays, in semaphores and other visual signals, in calculators, watches and in flashlights. Advantages of Light emitting diodes are many, but they also have their flaws.
Their flaws are high price per lumen, high dependence of the outside temperature and easy overheating if the outside temperature is too high and there is no heat sink. Despite their flaws, LEDs are finding their place in the human use and are here to stay. History of LEDs - Light Emitting Diodes Light-emitting diode is an electric component that emits light when connected to direct current.
But by the s, CFLs became slimmer, more affordable, and more efficient. Due to its microscopic size, it did not have practical everyday use. The next year, in , Nick Holonyak, Jr. Throughout the s, researchers and engineers continued experimenting with semiconductors with the goal of producing more efficient LEDs.
As they experimented with different chemical substrates, bright red and orange LEDs came into production. Then, in , M. George Craford, while working at Monsanto, used one red and one green diode to create a pale yellow light.
Monsanto became the first company to mass produce LED lights. Scientists continued to experiment with substrate materials, producing bright green, orange-red, orange, and yellow LEDs by the early s. Read What is Blue Lights? This excited the U. Department of Energy, which encouraged further development of white LEDs for commercial and residential use. LEDs light-emitting diodes are the most energy efficient lighting option available. To produce the same amount of light as a watt incandescent bulb, an LED light only uses 10 watts.
This is because LEDs use almost all of their energy as light, whereas incandescents give off most of their energy as heat. Like early versions of incandescent and fluorescent bulbs, they were once expensive and available in limited colors.
However, rapidly advancing technology has made them available at accessible prices, in a wide range of color temperatures, and with excellent CRIs color rendering indexes.
The earliest commercial LEDs were only available in blue-white light. Soft white K is ideal for lobbies, guest spaces, and residential living areas. Incidentally, Monsanto Company is the first company to produce LED lights on a large scale and for mass consumption.
During the mids, scientists started using only Gallium Phosphide to make LEDs that emitted a pale green light. These experiments resulted in improved versions of LEDs by the end of the decade. These LEDs could produce pure green light. The use of LED lights became popular during this decade when Fairchild Optoelectronics began to produce low-cost devices. Continuous and intensive research and development work into the LED technology led to the development of the first generation of super-bright red, yellow, and green LEDs in the early years of the s.
In the early s, scientists experimented with Indium Gallium Aluminum Phosphide as the semiconductor material to produce ultra-bright orange-red, orange, green, and yellow LEDs. These ultra-bright blue LEDs led the foundation for the development of cost-efficient and supremely functional white LED lights that are now commonly installed in commercial and manufacturing spaces, as shown in the image below.
Scientists discovered that by coating the blue light-emitting chip with fluorescent phosphors, the diode could be made to emit bright white light. The results produced by the white LEDs were impressive, and the U. Department of Energy encouraged the development of the white LED technology keeping in mind the needs of business owners to light up their commercial spaces with cost-efficient solutions.
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